TTL Sensor Unit SU-4 for remote release of Nikon flash units.
Detects the firing of the master flash (including built-in Speedlight) and sends a firing start signal to the slave unit.
Terminates the firing of the slave flash by detecting firing stop signal. Eliminates the need for connecting cord.
Operates effectively up to 25 feet from the location of the main flash.
Enables the use of multiple light sources.
Dimensions: 63 x 53 x 28 mm
Weight: 52g
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